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SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2022
SECURITIES |
Major Categories of Securities Owned by Entity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Treasury securities | ​ | $ | 247,665 | ​ | $ | — | ​ | $ | (13,134) | ​ | $ | 234,531
Corporate securities | ​ |  | 151,382 | ​ |  | 980 | ​ |  | (4,937) | ​ |  | 147,425
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | ​ |  | 443,266 | ​ |  | 905 | ​ |  | (26,055) | ​ |  | 418,116
Agency collateralized mortgage obligations ("CMOs") | ​ |  | 469,808 | ​ |  | 7 | ​ |  | (29,632) | ​ |  | 440,183
State and municipal obligations | ​ | ​ | 38,619 | ​ | ​ | 2 | ​ | ​ | (1,840) | ​ | ​ | 36,781
Total securities available-for-sale | ​ | $ | 1,350,740 | ​ | $ | 1,894 | ​ | $ | (75,598) | ​ | $ | 1,277,036
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 88,858 | ​ | $ | — | ​ | $ | (5,025) | ​ | $ | 83,833
Pass-through MBS issued by GSEs | ​ | ​ | 180,379 | ​ | ​ | — | ​ | ​ | (13,503) | ​ | ​ | 166,876
Agency CMOs | ​ |  | 114,685 | ​ |  | — | ​ |  | (6,705) | ​ |  | 107,980
Total securities held-to-maturity | ​ | $ | 383,922 | ​ | $ | — | ​ | $ | (25,233) | ​ | $ | 358,689
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 82,476 | ​ | $ | — | ​ | $ | (2,222) | ​ | $ | 80,254
Treasury securities | ​ | ​ | 247,916 | ​ | ​ | — | ​ | ​ | (3,147) | ​ | ​ | 244,769
Corporate securities | ​ |  | 148,430 | ​ |  | 4,354 | ​ |  | (754) | ​ |  | 152,030
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | ​ |  | 528,749 | ​ |  | 4,271 | ​ |  | (6,566) | ​ |  | 526,454
Agency collateralized mortgage obligations ("CMOs") | ​ |  | 527,348 | ​ |  | 2,705 | ​ |  | (8,795) | ​ |  | 521,258
State and municipal obligations | ​ | ​ | 39,175 | ​ | ​ | 73 | ​ | ​ | (302) | ​ | ​ | 38,946
Total securities available-for-sale | ​ | $ | 1,574,094 | ​ | $ | 11,403 | ​ | $ | (21,786) | ​ | $ | 1,563,711
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Pass-through MBS issued by GSEs | ​ | $ | 118,382 | ​ | $ | 59 | ​ | $ | (1,141) | ​ | $ | 117,300
Agency CMOs | ​ |  | 60,927 | ​ |  | — | ​ |  | (873) | ​ |  | 60,054
Total securities held-to-maturity | ​ | $ | 179,309 | ​ | $ | 59 | ​ | $ | (2,014) | ​ | $ | 177,354
Schedule of amortized cost and fair value of debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | March 31, 2022
​ | ​ | Amortized | ​ | Fair
(In thousands) | ​ | Cost | ​ | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 4,226 | ​ | $ | 4,196
One to five years | ​ | ​ | 277,389 | ​ | ​ | 262,734
Five to ten years | ​ | ​ | 150,906 | ​ | ​ | 146,993
Beyond ten years | ​ | ​ | 5,145 | ​ | ​ | 4,814
Pass-through MBS issued by GSEs and agency CMO | ​ | ​ | 913,074 | ​ | ​ | 858,299
Total | ​ | $ | 1,350,740 | ​ | $ | 1,277,036
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | — | ​ | $ | —
One to five years | ​ | ​ | 10,000 | ​ | ​ | 9,827
Five to ten years | ​ | ​ | 78,858 | ​ | ​ | 74,006
Beyond ten years | ​ | ​ | — | ​ | ​ | —
Pass-through MBS issued by GSEs and agency CMO | ​ | ​ | 295,064 | ​ | ​ | 274,856
Total | ​ | $ | 383,922 | ​ | $ | 358,689
Summary of Sale of Available-for-sale Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2022 |  | 2021
Securities available-for-sale | ​ | ​ | ​ | ​ | ​ | ​
Proceeds | ​ | $ | — | ​ | $ | 134,558
Gross gains | ​ | ​ | — | ​ | ​ | 1,307
Tax expense on gains | ​ | ​ | — | ​ | ​ | 414
Gross losses | ​ | ​ | — | ​ | ​ | 120
Tax benefit on losses | ​ | ​ | — | ​ | ​ | 38
Sales of Marketable Equity Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2022 |  | 2021
Proceeds: |  | ​ |  |  | ​ |
Marketable equity securities | ​ | $ | — | ​ | $ | 6,101
Gross Unrealized Losses and Fair Value of Investment Securities by Investment Category and Length of Time in a Continuous Unrealized Loss Position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | Less than 12 | ​ | 12 Consecutive | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Consecutive Months | ​ | Months or Longer | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(In thousands) |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Treasury securities | ​ | $ | 234,530 | ​ | $ | 13,134 | ​ | $ | — | ​ | $ | — | ​ | $ | 234,530 | ​ | $ | 13,134
Corporate securities | ​ | ​ | 95,535 | ​ | ​ | 4,847 | ​ | ​ | 2,910 | ​ | ​ | 90 | ​ | ​ | 98,445 | ​ | ​ | 4,937
Pass-through MBS issued by GSEs | ​ | ​ | 290,385 | ​ | ​ | 18,572 | ​ | ​ | 70,248 | ​ | ​ | 7,483 | ​ | ​ | 360,633 | ​ | ​ | 26,055
Agency CMOs | ​ | ​ | 320,114 | ​ | ​ | 16,773 | ​ | ​ | 116,425 | ​ | ​ | 12,859 | ​ | ​ | 436,539 | ​ | ​ | 29,632
State and municipal obligations | ​ |  | 31,150 | ​ |  | 1,308 | ​ |  | 4,190 | ​ |  | 532 | ​ | ​ | 35,340 | ​ | ​ | 1,840
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | Less than 12 | ​ | 12 Consecutive | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Consecutive Months | ​ | Months or Longer | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(In thousands) |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 58,607 | ​ | $ | 1,369 | ​ | $ | 21,647 | ​ | $ | 853 | ​ | $ | 80,254 | ​ | $ | 2,222
Treasury securities | ​ | ​ | 244,769 | ​ | ​ | 3,147 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 244,769 | ​ | ​ | 3,147
Corporate securities | ​ | ​ | 37,620 | ​ | ​ | 754 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 37,620 | ​ | ​ | 754
Pass-through MBS issued by GSEs | ​ | ​ | 422,634 | ​ | ​ | 6,333 | ​ | ​ | 4,748 | ​ | ​ | 233 | ​ | ​ | 427,382 | ​ | ​ | 6,566
Agency CMOs | ​ | ​ | 349,879 | ​ | ​ | 8,672 | ​ | ​ | 3,182 | ​ | ​ | 123 | ​ | ​ | 353,061 | ​ | ​ | 8,795
State and municipal obligations | ​ |  | 18,887 | ​ |  | 302 | ​ |  | — | ​ |  | — | ​ | ​ | 18,887 | ​ | ​ | 302

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